a(0) = 7, a(1) = 9; for n >= 0, a(2n+1) = a(2n-1)^2 - a(2n-2), a(2n+2) = a(2n)^2 - a(2n+1).

A007449

a(0) = 7, a(1) = 9; for n >= 0, a(2n+1) = a(2n-1)^2 - a(2n-2), a(2n+2) = a(2n)^2 - a(2n+1).

Terms

    a(0) =7a(1) =9a(2) =40a(3) =74a(4) =1526a(5) =5436a(6) =2323240a(7) =29548570

External references